PSN-L Email List Message

Subject: Re: SPRENGNETHER 201 LONG PERIOD VERTICAL SEISMOMETER
From: "meredith lamb" paleoartifact@.........
Date: Mon, 18 Aug 2008 22:17:02 -0600


Hi Barry,

Yes; Seans mechanical design is still likely the very best vertical
homebrew.  His flat spring setup is quite abit more difficult to make than
just using
a sprial coil spring; but it could make all the difference in the world.
Good food for thought.

At one time...Saint Louis University applied, or were going to apply for a
patent on that and on his (unknown) tiltmeter.  Perhaps, because
of the prior public release; it "became" public domain.  Regardless; his
vertical text and pictures is at:

http://www.eas.slu.edu/People/STMorrissey/newtable.html

They really limit access on the web site.  I was also interested in his
tiltmeter; but nobody there followed up after his 2002 death...which is
quite strange, as that University had a very long history of seismology.
Sean certainly was quite exceptionally very good at his work.

Take care,  Meredith





On Mon, Aug 18, 2008 at 8:37 PM, Barry Lotz wrote:

> Meredith
> The late STM had a (what I feel ) a good long period vertical design using
> hardware store materials (with some help from Macmaster Carr). There is an
> adjusting motor which slides a weight for zeroing. I also use a spiral
> bimetal spring from a analog themometer to help with daily temperature
> deflection drifts. I think others have constructed his design. I have been
> very pleased with the results.
> Barry
>
>
>
>
Hi Barry,
 
Yes; Seans mechanical design is still likely the very best vertical homebrew.  His flat spring setup is quite abit more difficult to make than just using
a sprial coil spring; but it could make all the difference in the world.  Good food for thought.
 
At one time...Saint Louis University applied, or were going to apply for a patent on that and on his (unknown) tiltmeter.  Perhaps, because
of the prior public release; it "became" public domain.  Regardless; his vertical text and pictures is at:
 
http://www.eas.slu.edu/People/STMorrissey/newtable.html 
 
They really limit access on the web site.  I was also interested in his tiltmeter; but nobody there followed up after his 2002 death...which is
quite strange, as that University had a very long history of seismology.  Sean certainly was quite exceptionally very good at his work.  
 
Take care,  Meredith  
 
   
 
 
 
On Mon, Aug 18, 2008 at 8:37 PM, Barry Lotz <barry_lotz@.............> wrote:
Meredith
The late STM had a (what I feel ) a good long period vertical design using hardware store materials (with some help from Macmaster Carr). There is an adjusting motor which slides a weight for zeroing. I also use a spiral bimetal spring from a analog themometer to help with daily temperature deflection drifts. I think others have constructed his design. I have been very pleased with the results.
Barry


 

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